Disposable diaper having lower concavity

Abstract

A disposable diaper includes a laminated panel having a topsheet, a backsheet and an absorbent core disposed therebetween to configure a front waist region, a rear waist region and a crotch region; the laminated panel is provided with a concavity extending a longitudinal center line of the panel from the rear waist region to the crotch region and depressed toward a surface of the panel remote from the wearer's skin.

What is claimed is:  
     
       1. A disposable diaper comprising: 
       a laminated panel having;  
       a liquid-pervious topsheet;  
       a liquid-impervious backsheet;  
       a liquid-absorbent core having an upper surface and being disposed between said topsheet and said backsheet so that said liquid-pervious topsheet contacts the entire upper surface of said liquid-absorbent core;  
       a front waist region;  
       a rear waist region; and  
       a crotch region extending between said front and rear waist regions,  
       said laminated panel being provided concavity,  
       said concavity being formed by joining together sections of transversely opposite side edges of said laminated panel which otherwise divert from one another along a centerline of the laminated panel.  
     
     
       2. The diaper according to  claim 1 , wherein said sections of the transversely opposite side edges which are joined together otherwise converge along a direction that extends from said rear waist region toward said crotch region and when said sections of the transversely opposite side edges are joined together said concave pocket has a depth which gradually increases from said rear waist region toward said crotch region. 
     
     
       3. The diaper according to  claim 2 , further comprising a pair of leak-proof cuffs each having a free side edge provided with an elastic member joined under tension thereto and a proximal side edge joined to the upper surface of said topsheet so that said elastic members bias said leak-proof cuffs and cause them to rise on said upper surface of said topsheet, said pair of leak-proof cuffs extending in said longitudinal direction in the vicinity of the transversely opposite side edges of said absorbent core and said pair of leak-proof cuffs gradually converge toward one another alone a direction that extends from said crotch region toward said rear waist region. 
     
     
       4. The diaper according to  claim 3 , wherein the free side edges of said leak-proof cuffs contact each other in said rear waist region. 
     
     
       5. The diaper according to  claim 3 , wherein longitudinally opposite ends of said leak-proof cuffs are collapsed onto an inner side of said diaper and joined to the upper surface of said topsheet. 
     
     
       6. The diaper according to  claim 1 , wherein the laminated panel includes a pocket having continuous sides which extend from the rear waist region to the front waist region. 
     
     
       7. The diaper according to  claim 1 , wherein the laminated panel includes a pocket that has a width that increases from the rear waist region toward the crotch region.